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Eight common misunderstandings about GPLv3

"When the latest draft was released, Stallman made clear that
the purpose of the GPL was to block methods "to make free software
proprietary." The first version of the license blocked the methods
known then: adding additional license terms, and not releasing the
source code. The second version added section 7 to block the use of
patents to impose restrictive conditions on users. "Now," Stallman
says, "we've found out about two other ways to try to make free
software effectively proprietary: one of them is TiVoization, and
the other is the Novell-Microsoft deal, so we're trying to block
them both. And any time we find some new threat to a user's
freedoms, we will try to block it.""